GE IACS1A Manuale utente

GEK—34053G

TYPES

IACS1A

FORM

800

AND

IACS1B

FORM

800

AND

IACS2A

FORM

800

AND

IAC52B

FORM

800

AND

INSTRUCTIONS

TIME

OVERCURRENT

RELAYS

GENERAL

ELECTRIC

GEK-34053

TABLE

CONTENTS

DESCRIPTION

APPLICATION

CONSTRUCTION

RATINGS

TIME-OVERCURRENT

UNIT

INSTANTANEOUS

UNIT

TARGET

AND

SEAL-IN

UNIT

CONTACTS

BURDENS

CHARACTERISTICS

RECEIVING,

HANDLING,

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

ELECTRICAL

TESTS

DRAWOUT

RELAYS,

GENERAL

POWER

REQUIREMENTS,

GENERAL

TIME-OVERCURRENT

UNIT

TIME

SETTING

PICKUP

TEST

TIME

TEST

INSTANTANEOUS

UNIT

SETTING

THE

INSTANTANEOUS

PICKUP

TEST

TARGET

AND

SEAL-IN

UNIT

PICKUP

AND

DROPOUT

TEST

INSTALLATION

TIME-OVERCURRENT

UNIT

TARGET

AND

SEAL-IN

UNIT

INSTANTANEOUS

UNIT

PERIODIC

CHECKS

AND

ROUTINE

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

UNIT

TARGET

AND

SEAL—IN

UNIT

CONTACT

CLEANING

SYSTEM

TEST

SERVICING

TIME-OVERCURRENT

UNIT

PICKUP

TESTS

TIME

TESTS

INSTANTANEOUS

UNIT

TARGET

AND

SEAL-IN

UNIT

RENEWAL

PARTS

LIST

FIGURES

(Cover

photo

8041316)

UNIT

MAINTENANCE

PAGE

...

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GEK-34053

TIME

OVERCURRENT

RELAYS

DESCRIPTION

The

Type

IAC51

and

1AC52

relays

are

single—phase,

current—

operated,

devices

with

inverse

time/current

characteristics.

They

are

utilized

protect

commercial,

industrial,

and

utility

power

distribution

systems

against

either

multi—phase

phase—to—ground

faults.

Each

relay

consists

basic

induction—disk

time—overcurrent

unit,

and

dual—rated

target/seal—in

unit,

and

may

include

hinge—

type

instantaneous—overcurrent

unit.

Both

the

time—overcurrent

unit

and

the

instantaneous

unit

are

adjustable

over

range

about

The

available

ranges

amperes

both

units,

well

information

their

continuous

rating,

contact

rating,

and

target/seal—in unit

tap

ratings

are

given

the

section

RATINGS.

standard

case

used

mount

each

relay.

The

outline

and

mounting

dimensions

this

case

are

shown

Figure

12.

The

basic

differences

between

the

relays

covered

these

instructions

are

noted

in the

following

table:

TYPE

INSTANTANEOUS CONTACT

INTERNAL

UNIT

CIRCUIT

CONNECTIONS

IACS1A

FIGURE

IAC51B

YES

FIGURE

IAC52A

FIGURE

IAC52B

YES

FIGURE

The.se

instructions

not

purport

cover

all

details

variations

equipment

nor provide

for

every

possible

contingency

met

connection with

installation,

operation

maintenance.

Should

further

information

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser’s

purposes,

the

matter

should

referred

the

General

Electric

Company.

the

extent

required

the

products

described

herein

meet

applicable ANSI,

IEEE

and

NEMA

standards;

but

such

assurance

given,

with

respect

local

codes

and

ordinances

because

they

vary

greatly.

GEK-34053

APPLICATION

The

inverse

time—current

characteristics

make

the

IAC51

and

IACS2

relays

well

suited

for

multi—phase

and

phase—to—ground

fault

protection

commercial,

industrial,

and

utility

distribution

systems,

and

frequently

for

overload

back-up

protection.

They

are

particularly

well

suited

for

application

locations

where

the

fault—current

magnitude

dependent

mainly

upon

the

location

the

fault relative

to the

relay

and

only

slightly

upon

the

system

generating

setup

the

time

the

fault.

The

general

practice

use

set

three

relays

for

interphase

faults

and

separate

relay,

residually

connected,

for

single—phase—to—ground

faults.

Use

separate

ground

relay

advantageous

because

can

adjusted

provide

more—sensitive

protection

ground

faults.

Typical

connections

for

such

application

are

shown

Figure

14.

typical

application

and

external

connections

the

IAC52A,

which

has

two

closing

contacts, is

shown

Figure

15.

Care

should

taken

applying

this

relay,

since

simultaneous

closing

both

contacts

may

not

occur.

the

application

IAC51

and

relays

with

automatic

reclosing

devices,

the

reset

time

should

considered.

The

reset

time

all

relays

covered

these

instructions

approximately

seven

seconds

secs),

from

the

fully—closed

the

fully—open

position,

when

set

number

the

time

dial.

When

setting

these

relays

coordinate

with

downstreamu

relays,

coordination

time

from

0.25

0.40

second

generally

allowed.

These

coordination

times

include,

addition

breaker—clearing

time,

0.10

second

for

relay

overtravel

and

0.17

second

for

safety

factor.

For

example,

the breaker—clearing

time

0.13 second

cycles),

the

coordination

time

would

0.40

second.

the

relay

operating

time

set

test

the

current

level

question,

the

safety factor

may

reduced

from

0.17

0.07 second

with

relay

overtravel

.10

second.

Then

the

“downstream”

breaker

time

cycles

(0.08

sec)

minimum

0.25

second

could

allowed

for

coordination.

CONSTRUCTION

The

induction

unit

the

basic

unit

all

Type—IAC

relays.

Figures

and

show

the

induction

unit

mounted

the

cradle.

These

units

are

the

induction—disk

construction

type.

The

disk

actuated

current—operating

coil

laminated

U—magnet.

The

disk

shaft

carries

the

moving

contact,

which

completes

the

alarm

trip

circuit

when

touches

the

stationary

contact

contacts.

The

disk

shaft

restrained

spiral

spring

give

the

proper

contact—closing

current,

and

its

motion

retarded

by a

permanent

magnet

acting

the

disk

to give the

correct

time

delay.

There

target

and

seal—in

unit

mounted

the

front,

the

left

the

shaft

the

time—overcurrent

unit.

The

seal—in

unit

has

its

coil

series

and

its

contacts

parallel

with

the

contacts

GEK-34053

the

time—overcurrent

unit,

such

that

when

the

induction—unit

contacts

close,

the

seal—in

unit

picks

and

seals

in.

When

the

seal—in

unit

picks

up,

raises

target

into

view,

which

latches

and

remains

exposed

until

released

pressing

button

beneath the

lower

left

corner

the

cover.

The

instantaneous

unit

small

hinge—type

unit,

which

mounted

the

front

the

models

the

right

the

shaft

the

time—overcurrent

unit.

Its

contacts

are

normally

connected

parallel

with

the

contacts

the

time—overcurrent

unit

and

its

coil

connected

series

with

the

time—overcurrent

unit.

When

the

instantaneous

unit

picks

raises

target,

which

latches

and

remains

exposed

until

released.

The

same

button

that

releases

the

target

the

seal—in

unit

also

releases

the

target

the

instantaneous

unit.

RATINGS

TIME-OVERCURRENT

UNIT

Ratings

for

the

time—overcurrent

unit

are

shown

Table

TABLE

PICKUP

RANGE,

AMPERES

RELAY

FREQUENCY

MAIN

(TIME)

INSTANTANEOUS

CYCLES

UNIT UNIT

IAC51A

and

0.5

4.0

IAC52A

2.0

16.0

IAC51B

and

0.5

4.0

0.5

—

4.0

IAC52B

2.0

—

16.0

2.0

16.0

10.0

80.0

20.0

160.0

Available

taps

the

time—overcurrent

unit

are

shown

Table

II.

TABLE

RANGE,

AMPERES

TAPS

AVAILABLE

(AMPERES)

0.5

4.0

0.5,

0.6. 0.7,

0.8

1.0,

1.2, 1.5,

2.0,

2.5, 3.0,

4.0

2.0

2.0, 2.5,

3.0,

4.0,

5.0,

6.0, 7.0,

8.0,

10.0,

12.0.

The

one—second

thermal

ratings

are

listed

Table

III.

K-34053

TABLE

III

TIME

OVERCURRENT

UNIT

ONE

SECOND

(AMPS) RATJNG(AMPS)

0.5

4.0

70.0

4,900.0

2.0

16.0

260.0

67,600.0

For

ratings

for

less

than

one

second,

the

rating

may

calculated

according

the

formula

where

the

time,

seconds,

that

the

current

flows.

The

continuous

ratings

the

time—overcurrent

units

are

shown

Tables

and

TABLE

0.5

4.0

AMP RANGE

TAP

0.5 0.6

0.7

0.8

1.0

1.2

1.5

2.0

2.5 3.0

4.0

RATING

1.6

1.8

2.0

2.1

2.3 2.7

3.0

3.5

4.0 4.5

5.0

TABLE

2.0

16.0

AMP

RANGE

TAP

2.0

2.5

3.0

4.0

5.0

6.0 7.0

8.0

10.0

12.0

RATING

8.0

9.0

10.0

12.0

14.0 15.0 16.0 17.5

20.0

INSTANTANEOUS

UNIT

The

instantaneous

unit

has

double—wound

coil

for

operation

either

one

two

ranges.

Any

setting

obtained

the

lower

range

(series

connected)

doubled,

within

±10%,

when

the

unit

connected

for

high—range

operation

(parallel

connected).

The

instantaneous

unit

has

continuous

rating

1.5 times

minimum

setting

amperes, whichever

smaller.

Example:

the

2.0—16.0

ampere

instantaneous

unit,

when

set

the

low

range

(2.0—

8.0

amperes) has

continuous

rating

3.0

amperes,

and

when

connected

for

high—range

operation

(4.0—16.0

amperes)

has

continuous

rating

6.0

amperes.

The

continuous

and

one—second

ratings

for

the

instantaneous

unit

are

shown

Table

VI.

GEK-34053

TABLE

RANGE

CONNECTIONS

CONTINUOUS

I-

ONE

RATING

SECOND

0.5

4.00

0.5

2.00

0.75 25.0

625

1.0

4.00

1.5

50.0 2,500

2.0

16.0

2.0

8.00

3.0

130.0

16,900

4.0

16.00

6.0

260.0 67,600

10.0

80.0

10.0

40.0

15.0

400.0

160,000

20.0

80.0

25.0 600.0

360,000

20.0

160.0

20.0

80.0

25.0

600.0

360,000

40.0

160.0

25.0

600.0

360,000

Higher

currents

may

applied

for

shorter

lengths

time

accordance

with

the

formula

1=!—

‘I,

where

the time,

seconds,

that

the

current

flows.

Series

connected,

Parallel

connected

TARGET

AND

SEAL-IN

UNIT

Ratings

for

the

target

and

seal—in

unit

are

shown

Table

VII

TABLE

VII

TAP

0.2

2.0

D.C.

Resistance

±10%

(ohms)

0.13

Operating

(amperes)

25%

0.2

2.0

Carry

Continuously

(amperes)

0.3

3.0

Carry

Amps

for

(sec.)

0.03

4.0

Carry

Amps

for

(sec.)

0.25 30.0

Impedance

(ohms)

52.0

0.53

the

tripping

current

exceeds

amperes

auxiliary

relay

should

used,

the

connections

being

such

that

the

tripping

current

does

not

pass

through

the

contacts

the

target

and

seal—in

coils

the

protective

relay.

CONTACTS

The

current—closing

rating

the

contacts

amperes

for

voltages

not exceeding

250

volts.

The

current—carrying

rating

limited

the

ratings

the

seal—in

unit.

GEK-34053

BURDENS

Burdens

for

the

time—overcurrent

unit

are

given in Table

VIII.

TABLE

VIII

RANGE

MIN.

BURDENS

MIN.

BURDENS

V.A.

AMPS

TAP

PICKUP

MIN.

TAP

OHMS

(1)

CALCULATED

FROM

IMPEDANCE

MIN.

PICKUP

(121)

20.0

TIMES

TIMES TIMES

PICK- PICK-

PICK

0.5

0.4

0.5

5.60

21.0 22.0

10.80

5.00

3.66

550.0

2.0

15.0

2.0

0.37

1.44 1.45

0.65

0.32 0.24

36.3

NOTE:

The

impedance

values

given

are

those

for

the

minimum

tap

each

relay.

The

impedance

for

other taps

pick

current

(tap

rating)

varies

inversely

(approximately)

the

square

the

tap

rating.

For

examp1e

for

relay

with

0.5-4.0

amp

range, the

impedance

the

0.5

amp

tap

given

22.0

ohms.

The

impedance

the

2.0

amp

tap

2.0

amperes

(.5/2)2

1.37

ohm.

The

instantaneous

unit

burdens

are

listed

Table

IX.

TABLE

BURDENS

MIN.

BURDENS

RANGE

tCON-

MIN.

PICKUP

MIN.

TAP

OHMS

(1)

NEC-

TAP

___________________

__________________

RELAYS

TIONS

AMPS

20.0

V.A.

5AMPS

ONLY

OHMS OHMS

OHMS

TIMES TIMES

TIMES

CALCULATED

FROM

(AMPS)

PICK PICK

PICK

IMPEDANCE

MIN.

UP UP

PICKUP

(12Z)

5—4

LOW

0.5

12.7

11.5

17.1

9.6

8.7

8.2

427.5

HIGH

1.0 3.18 2.87

4.28 2.40 2.18

2.04

107.0

0-16

LOW

2.0

0.76 0.72

1.05

0.59

0.53

0.50

26.25

HIGH

4.0

0.189

0.180

0.261

0.147

0.133

0.125

6.63

0-80

LOW

10.0

0.042

0.029

0.051

0.029

0.026 0.024 1.28

HIGH

20.0

0.010

0.007 0.013 0.007

0.007

0.006

0.33

20.0-160.0

LOW

20.0

0.015 0.008

0.017

0.010

0.009

0.008

0.43

HIGH

40.0

0.004

0.002

0.004

0.002 0.002

0.002

0.10

Low

means

two

windings

connected

series.

High means

two

windings

connected

parallel.

See

Internal-Connections

diagram

for

additional

information.

GEK-34053

CHARACTERI

STICS

Pickup

these

relays

defined

the

current

required

the

contacts

from

the

0.5

time—dial

position.

The

pickup

value

the

IAC51

relays is

within

tap

value.

The

setting

the

time

dial

determines

the

length

time

the

unit requires

its

contacts

when

the

current

reaches

the

predetermined

value.

The

contacts

are

just

closed

when

the

dial

set

zero.

When

the

dial

set

10,

the

disk

must

travel

the

maximum

distance

the

contacts;

this

gives

the

maximum

time

setting.

The

unit

resets

90%

the

minimum

closing

value

current.

The

time

reset

to the

No.

time—dial

position

when

the

current

reduced

zero

approximately

seconds.

Figure

shows

the

and

Figure

shows

the

time/current

characteristics

for

relay

types

IAC51

and

1AC52.

The

time/current

curve

for

the

instantaneous

unit

shown on

Figure

RECEIVING,

HANDLING,

AND

STORAGE

These

relays,

when

not

included

part

control

panel,

will

shipped

cartons

designed

protect

them

against

damage.

Immediately

upon

receipt

relay,

examine

for

any

damage

sustained

transit.

injury

damage

resulting

from

rough

handling

evident,

file

damage

claim

once

with

the

transportation

company

and

promptly

notify

the

nearest

General

Electric

Sales

Office.

Reasonable

care

should

exercised

unpacking

the

relay

order

that

none

the

parts

are

injured

nor

the

adjustments

disturbed.

the

relays

are

not

installed

immediately,

they

should

stored

their

original

cartons

place

that

free

from

moisture,

dust,

and

metallic

chips.

Foreign

matter

collected

the

outside

the

case

may

find

its

way

inside

when

the

cover

removed

and

cause

trouble

the

operation

the

relay.

ACCEPTANCE

TESTS

Immediately

upon

receipt

the

relay

INSPECTION

AND

ACCEPTANCE

TEST

should

made

make

sure

that

damage

has

been

sustained

shipment

and

that

the

relay

calibrations

have

not

been

disturbed.

the examination

test

indicates

that

readjustment

necessary,

refer

the

section

SERVICING.

These

tests

may

performed as

part

the

installation

acceptance

tests,

the

discretion

the

user.

Since

most

operating

companies

use

different

procedures

for

acceptance

and

for

installation

tests,

the

following

section

includes

all

applicable

tests

that

may

performed

these

relays.

GEK-34053

VISUAL

INSPECTION

Check

the

nameplate

stamping

make

sure

that

the

model

number

and

rating

the

relay

agree

with

the

requisition.

Remove

the

relay

from

its

case

and

check

that

there

are

broken

cracked

molded

parts

other

signs

physical

damage,

and

that

all

screws

are

tight.

MECHANICAL

INSPECTION

There

should

noticeable

friction

when

the

disk

rotated

slowly

clockwise.

The

disk

should

return

itself

its

rest

position.

Make

sure

the

control

spring

not

deformed,

nor

its

convolutions

tangled

touching.

The

armature

and

contacts

the

seal—in

unit,

well

the

armature

and

contacts

the

instantaneous

unit,

should

move

freely

when

operated

hand;

there

should

least

1/32”

wipe

the

seal—in

contacts.

The

targets

the

seal—in

unit

and

the

instantaneous

unit

must

come

into

view

and

latch

when

the

armatures

are

operated

hand,

and

should

unlatch

when

the

target

release

lever

operated.

Make

sure

that

the

fingers

and

shorting

bars

agree

with

the

internal—connections

diagram.

CAUTION

Every

circuit

the

drawout

case

has

auxiliary

brush.

especially

important

current

circuits

and

other

circuits

with

shorting

bars

that

the

auxiliary

brush

bent

high

enough

engage

the

connecting

plug

test

plug

before

the

main

brushes

do.

This

will

prevent

Current

Transformer

(CT)

secondary

circuits

from

being

opened.

See

Figure

ELECTRICAL

TESTS

DRAWOUT

RELAYS,

GENERAL

Since

all

drawout

relays

service

operate

their

cases,

recommended

that

they

tested

their

cases

equivalent

steel

case.

this

way,

any

magnetic

effects

the

enclosure

will

accurately

duplicated

during

testing.

relay

may

tested

without

removing

from

the

panel

using

12XLA13A

test

plug.

This

plug

makes

connections

only with

the

relay

and

does

not

disturb

any

shoring bars

the

case.

The

12XLA12A

test

plug

may

also

used.

Although

this

test

plug

allows

greater

testing

flexibility,

requires

C.T.

shorting

jumpers

and

the

exercise

greater

care,

since

connections

are

made

both

the

relay

and

the

external

circuitry.

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